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by nick_meister 2192 days ago
The first time, you can use a Yogurt without artificial flavor. Afterward, you can reuse the Yogurt made the first time. Or just use a common Yoghurt from the store. You can use less than 0.2L the first time because the artificial flavor mixed with the natural Yoghurt flavor will not taste that good. The second time and afterward you can use the Yogurt made the first time, the artificial flavor will be diluted.

EDIT: Warning, I do not know how many times can you safely reuse the Yogurt. I've reused the 'same' Yogurt several times without any issue, but please do your research. Of course, I store it in the fridge.